CVE-2023-30626Public exploitNetwork attack vector

Authenticated arbitrary file write via path traversal

Published Apr 24, 2023 · Updated Feb 12, 2025

Path traversal in Jellyfin 10.8.0 through 10.8.9 allows remote authenticated users to write attacker-controlled log files outside the log directory. ClientLogController builds a filename from attacker-controlled Client and Version authorization fields, passes it to Path.Combine, and writes without verifying that the resolved path remains in the log directory. Low-privileged account access permits arbitrary .log file placement; code execution requires chaining the separate stored XSS flaw and administrator interaction.

CVSS severity8.8
High
EPSS probability1.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Jellyfin 10.8.0 through 10.8.9 allows remote authenticated users to write attacker-controlled log files outside the log directory. ClientLogController builds a filename from attacker-controlled Client and Version authorization fields, passes it to Path.Combine, and writes without verifying that the resolved path remains in the log directory. Low-privileged account access permits arbitrary .log file placement; code execution requires chaining the separate stored XSS flaw and administrator interaction.

The record

CVE
CVE-2023-30626
Published
Apr 24, 2023
Updated
Feb 12, 2025
Vendor
Jellyfin
Product
Jellyfin
Classifications
CWE-22, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 10.8.0, < 10.8.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Jellyfin · Jellyfinversion=>= 10.8.0, < 10.8.10

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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